ConstraintIB/ fish 3d Lagrangian surface visualization from lag_data.visit

[Vinod Thale]

Dear professor,

I am running a 3D ConstraintIB fish case based on the eel3d-style workflow. The simulation writes lag_data.visit, and I can export the Lagrangian structure to VTK using VisIt.

However, the exported Lagrangian VTK appears to contain only marker/vertex cells:

points = 16979 cells = 16979 cell type = VTK_VERTEX

So ParaView/PyVista shows a 3D marker cloud rather than a smooth connected fish surface. 

My question is: for ConstraintIB/fish3d-style simulations, is the expected Lagrangian visualization output only marker vertices, or is there an existing IBAMR/VisIt method to export a connected surface mesh for smoother visualization?

Thank you,
Vinod

[Boyce Griffith]

For ConstraintIBMethod (as well as similar methods, like IBMethod), the structures' data structures don’t include enough information to cleanly render surfaces.

For stair-step-like meshes, it would probably be straightforward to treat it like a mixed hex-tet mesh for visualization or post-processing, but that is not something that we have direct support for at this time.

— Boyce

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[Vinod Thale]

Dear Professor,

Thank you very much for the clarification.

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